Reversing attachment for screw-cutting lathes



(No Model.) 7 2 Sheets-Sheet 1.

' J.-J. MESSING.

REVERSING ATTACHMENT FOR SCREW CUTTING LATHES.. No. 482,261. PatentedSept. 6, 1892.

TN: New: rinks co, maTo-umc., WASHKNHTBN, n. L

(No Model.) 2 Sheets-Sheet 2.

. J. J. MESSING. REVERSING ATTACHMENT FOR SGEBW CUTTING LATHES. No.482,261. Patented Sept. 6, 1 892.

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1 UNITED STATES PATENT OFFICE.

JOHN J. MESSING, OF ST. LOUIS, MISSOURI.

REVERSING ATTACHMENT FOR SCREW-CUTTING LATHES.

SPECIFICATION forming part of Letters Patent No. 482,261, datedSeptember 6, 1892.

Application filed January 12, 1892. Serial No. 417,834:- (No model.)

To all whom, it may concern.-

Be it known that 1, JOHN J. MnssINe, of the city of St. Louis, in theState of Missouri, have invented a certain new and useful Improvement inReversing Attachments for Screw- Cuttin g Lathes, of which the followingis a full,

clear, and exact description, reference being had to the accompanyingdrawings, forming part of this specification.

This invention relates to means for reversing the screw-cut of a lathefrom the normal right-hand to a left-hand thread by theintervention of abroad overlap pinion between the drive-pinion on the cone-shaft and theleader-wheel; and the invention consists in features of noveltyhereinafter fullydescribed, and pointed out in the claims.

Figure I is a plan top view and shows the hanger-bearing of theintermediate pinion mounted on the previous seat of the leaderwheel,which wheel is moved laterally 011 its spindleout of gear with itsprevious drivepinion, and said broadintermediate pinion is shown gearedwith said drive-pinion and with said leader-wheel, thereby reversing themovement of the latter. Fig. II is an end view and shows the reversingaction of said intervening pinion and the hanger attachment of thechaser-bar that carries the chaser-tool with its leader-die engagementwith the screwhob. It also shows the set-screw attachment of theangle-arm of the hanger to the reargear-arm. Fig. III is a perspectiveview of the intermediate reversing-pinion and shows its hanger, thebearing by which said hanger is mounted, and its perforate angle-arm bywhich said intermediate pinion is held in gear with the pinion thatdrives it and the leaderwheel which it drives; and Fig. IV is amodification of said hanger-arm minus its anglearm, in whichmodification said intermediate pinion is maintained in itsreversing-gear by the tightening of the bearings of said hangerarm bymeans of a set-screw that is seated in extension-lugs that project fromsaid bearings. Fig. V is an enlarged vertical detail section takenthrough the leader bearer-rod, the leader gear-wheel mounted thereon,the integral sleeve that projects from said wheel longitudinally alongsaid bearerrod, the feather or key projecting from said sleeve, theleader-hob provided with the key-seat, the

head gear-frame of the lathe, and 2 is the back gear-frame. 3 representsthe mandrel, that has its journal-bearings in said head gear-frame. 4 isthe step cone-pulley, fast mounted on said mandrel and with which pulleythe power-belt engages, and 5 is the chuck secured to and that turnswith said mandrel and holds the metal 6, within or around which thescrew is to be cut, and 7 is the drive-pinion, which is also mounted onsaid mandrel.

8 represents the leader bearer-rod, which is mounted in the upper arms 9of the back gear-frame 2, on which bearer-rod is mounted the usualleader gear-wheel 10 and its leader, hob 11, that is governed by andturns with said wheel-clutch connection therewith, and 12 is thescrew-nut, which is screw-seated on said bearer-rod and adjusts andholds said leaderwheel and hob to their seats thereon. There is anumberof said transferable leader-holes, the peripheral guide-screws 13 ofwhich are graded, respectively, from fine threads to coarse tocorrespond with and lead the cut of the various screws that aremanufactured by the lathe.

13 represents the guide-screw around the periphery of the leader-hob 11,and 14 is the leader-die, which follows between the threads of saidguide-screw and by its connections, to be presently described, leads thechasertool 15 to effect the cutting of either an inner or outer screw.

16 represents the chaser-bar, which has free latitude longitudinally inthe bearings 17 in the lower arms 18, which arms are securely attachedto the lathe-bed 47 by the set-screws 48, and said chaser-bar moveslongitudinally in its hearings to the length of cut of the screw-threadsto be effected, and has a rotary or oscillating movement therein tocorrespond with the movement of said chaser-tool as the workman forcesit to its work or retires it therefrom, as the case may be. 19represents an approximately vertical guide-arm, which is fast mounted onsaid chaser-bar 16 and to whose head is secured the aforesaid leader-die14 by the set-screw 20. The splittube attachment end or split-holderclamp 21 of the chaser-tool 15 is fast mounted on the chaser-bar 16 bymeans of a draw-screw 42, that engages in its screw-seat 43, and saidchaser-tool is operated by its handle 22 in effecting the cutting of thescrew. I

23 represents the adjustable slide of the chaser-tool, which slide isheld to its adjustment by the screw-clamp 34, the said adj ustmentvarying to the diameter of the screw to be cut. 25 is the die-holderturret secured to said slide, and 26 is the die-cutter, which is securedto said holder by the setscrew 27.

The aforesaid operative controlling connections between said leader-die14, (which is itself controlled by said peripheral guide-screw 13,) onthe one hand, at the drive end, and the chaser-tool 15, guided anddriven thereby, on

the other hand, are said guide-arm19, on which said leader-die ismounted, (said die driving said guide-arm,) the chaser-bar 16, on whichsaid guide-arm is mounted, (said guide-arm driving said chaser-bar,) andthe split-holder clamp 21 of the chaser-tool 15, with its drawscrew 42,which clamp tightens the hold of said chaser-tool 15 on said chaser-bar16, and thus said chaser-tool is guided and driven to efiect itsscrew-cut, the respective right and left hand thread cuts beingdominated by the respective use and disuse of the broad interveningpinion 32, as hereafter d escribed. The pitch of said screws to be outare adjusted by the respective transfer of the leader-hob 11 andtheleader-die14 to those that accord with the desired pitch.

The chaser-tool and its on tting-die, as shown in Fig. I, is adjustedfor cutting an inner screw for a nut in the blank 6, which blank ischucked on the rotary mandrel of the lathe. The cutting of an outerscrew is alike effected after the readjustment of the die-cutter 26 andthe reversion of the chaser-tool.

Previous to the mounting of my reversegear attachment the leader-wheel1O retains its normal position, (shown in broken lines in Fig. 1,) inwhich case it gears direct with the drive-pinion 7, that is mounted onthe mandrel or cone-carrier shaft 3, so that it, with its screwguide-hob II, turns in the direction shown in the broken-line arrow inFig. II and guides the chaser-tool to cut a right-hand screw in or onthe chucked blank 6, as the case may be, in accordance with whether aninner or outer screw is required to be out.

While it has been necessary to describe and show the abovenumerically-indicated parts of the screw-cutter lathe on which is to bemounted my reverse-gear attachment to facilitate a knowledge of mydevice, yet the leading features of my invention are embodied in myreverse gear and its attaching devices, which I will now proceed todescribe.

28 represents my reverse-gear attachment, which is constituted of thehanger-bar 29, the tube-bearing 30 of which is mounted on the leaderbearer-rod 8, the journal 31, that projects from said hanger-bar, thebroad-geared intervening coupling-pinion 32, mounted n said journal, thefunction of said intervening pinion being to reverse the leader-gear,the screw-nut 33, that holds said pinion on its journal-seat, and theangle-arm 34, that projects at a right angle from the main bearing endof said hanger-bar, in the perforate end 35 of which arm a set-screw 36is seated, which screw engages in the screw-seat 37 in the rear.

gear-frame 2.

The means of attachment and operation of said intervening gear-reversingattachment is as follows: The leader-wheel 10 and its screw guide-hob 11are removed from their bearerrod 8, in which said leader-wheel hadoccupied the position shown in broken lines in Fig. I, in which itdirectly geared with the drivepinion 7, by which meansit and itsguidehob 11, by the action of the leader-die 14, the guide-arm 19, thechaser-bar 16, and the chaser-screw-cutting tool 15, had in its normalposition been enabled to effect the cutting of a right-hand screw in oron (as the case may be) the clutched blank 6; but when,

it is required to cut left-hand screws in or on said clutched blank 6,the leader-wheel and its screw guide-hob having been removed, as stated,the tube-bearing 30 of the hanger-bar 29 is mounted on the leaderbearer-rod 8 on the previous seat of the leader-wheel 10, and one sideof the broad intervening pinion 32,

which is mounted on the pendent end of said hanger-bar, is brought intogear connection with the drive-pinion 7. The leader-wheel 10 and itsscrew guide-hob are then replaced on their mount on the bearer-rod 8immediately outside the tube-bearing 30 of the hanger-bar 29, the saidleader wheel being thus also brought into gear with mybroad interveningpinion 32, which latter pinion thus both transfers and reverses theaction of the drive-pinion 7 on the leader-wheel 10 and its guide-hob11. It will thus be seen that as the leader elements of the device arethus by the intervention of my reversing attachment reversed from aright to a left hand movement the action of the chaser-screw-cuttingtool, being governed thereby, has its movement alike reversed and cuts aleft-hand screw.

In the modification shown in Fig. IV the angle-arm 34 is reduced to ashort stump, and it and the adjacent end of the main hangerbar 29 areprovided with a split opening 38; also, instead of the closedconstruction of the bearing 30, as shown in Figs. I, II, and III,integral lugs 39 project beyond said bearing, and a setscrew 40, seatedin its perforate screw-seats 41 in said lugs, springs them together, soas to effect a sufficiently rigid bearing on the rod 8 to securetheretention of the,

intervening reversing pinion-wheel 32 in gear with the pinion-wheel 7that drives it and with the leader-wheel 10 that it drives. The splitopening 38 facilitates the work of said set-screw in drawing said lugstoward each other and thus contracting the bearings. This modificaiionis intended to be used where my reversing device is attached tostationary lathes, access to whose leader-gear is obstructed by anymeans, so as to make it difficult to make the reinforce connections ofthe angle-arm 34 by the set-screw 36 to the rear gears.

In the modification shown in Fig. IV the open end of the split bearingis shown as open back between the lugs 39 to the full diameter of thebearings, so as to enable the attachment of the hanger-bar 29 on itsbearings with only a lateral displacement of the leader-Wheel from itsseat on its bearer-rod without removal from said rod, as shown in fulllines in Fig. IV; but also, as shown in broken lines in said figure,this part of the device may have a nearly-closed split bearing, so as toeffect a more rigid set to its fast bearing.

I claim as my invention 1. In a reversing attachment for screw-cuttinglathes, the combination of the leader gear-wheel 10 and screw guide-hob11, the elongated bearing-rod 8, on which said leaderwheel and hob arelaterally adjustable, the drive-pinion 7, the mandrel of the lathe onwhich said drive-pinion is mounted, the hanger-bar 29, the journal 31,that projects from said hanger-bar, the tube-bearing'30, that mounts tosaid bar, and the broad intervening reversing-pinion 32, that is mountedon said journal 31 and effects areversing movement of said leader-wheelto that of its normal drive, substantially as described.

2. In a reversing attachment for screw-cutting lathes, the combinationof the elongated bearing-rod 8, the leader gear-wheel '10, and screwguide-hob 11, laterally adjustable on said rod, the back gear-frame inwhich said rod is mounted, the drive-pinion 7, mounted on the mandrelthat carries the cone-pulleys, the hanger-bar 29, having the mountingtubebearing 30, the journal 31, that projects from said hanger-bar, thebroad intervening reversing-pinion 32, mounted on said journal, theperforate angle-arm 34, that projects from said hanger-bar, and theset-screw 36, that secures said angle-arm to the back gear-frame,substantially as described.

3. In a reversing attachment for screw-cutting lathes, the combinationof the laterallyadjustable leader gear-wheel and screw guidehob, thedrive-pinion 7, the attachable hangerbar 29, carrying the journal 31,the broad intervening reversing-pinion 32, mounted on said journal, saidhanger-bar provided with the slit-opening 38, the perforate lugs 39, andthe setscrew 40, that tightens the mounting bearings of said hanger-arm,substantially as described.

4:. In a reversing attachment for screw-cutting lathes, the combinationof the laterallyadjustable leader gear-wheel 10 and screw guide-hob 11,the drive-pinion 7, the attachable hanger-bar 29, the intervening broadreversing-pinion 32, carried by said attachable hanger-bar, theguide-screw 13 on the periphery of said hob 11, the leader die let, thatworks in said screw, the guide-arm 19, the chaser-bar 16, thechaser-tool15, the die-holder turret 25, the die-cutter 26, theset-screw that holds said cutter, the chuck 5 on the mandrel, and theblank 6, held by said chuck while said cutter effects its respectiveright and left hand screw cuts, substantially as described.

5. In a reversing attachment for screw-cutting lathes, the combinationof the reversingpinion 32, the interchangeable leader gearwheel 10, andthe hanger-bar that carries said pinion, the screw guide-hob 11, anddrive-pinion 7, substantially as setforth.

JOHN J. MESSING.

In presence of- BENJN. A. KNIGHT, SAML. KNIGHT.

